单词 | coma |
释义 | coma1[ koh-muh ] / ˈkoʊ mə / SEE SYNONYMS FOR coma ON THESAURUS.COM noun, plural co·mas.a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person. Origin of coma1First recorded in 1640–50, coma is from the Greek word kôma deep sleep Words nearby comaColwyn Bay, coly, colza, colza oil, COM, coma, coma aberration, Coma Berenices, comaker, comal, co-manage Definition for coma (2 of 2)coma2 [ koh-muh ] / ˈkoʊ mə / noun, plural co·mae [koh-mee]. /ˈkoʊ mi/.Astronomy. the nebulous envelope around the nucleus of a comet. Optics. a monochromatic aberration of a lens or other optical system in which the image from a point source cannot be brought into focus, the image of a point having the shape of a comet. Botany.
Origin of coma21660–70; <Latin: hair <Greek kómē Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for comaBritish Dictionary definitions for coma (1 of 2)coma1 / (ˈkəʊmə) / noun plural -masa state of unconsciousness from which a person cannot be aroused, caused by injury to the head, rupture of cerebral blood vessels, narcotics, poisons, etc Word Origin for comaC17: from medical Latin, from Greek kōma heavy sleep; related to Greek koitē bed, perhaps to Middle Irish cuma grief British Dictionary definitions for coma (2 of 2)coma2 / (ˈkəʊmə) / noun plural -mae (-miː)astronomy the luminous cloud surrounding the frozen solid nucleus in the head of a comet, formed by vaporization of part of the nucleus when the comet is close to the sun botany
optics a type of lens defect characterized by the formation of a diffuse pear-shaped image from a point object Derived forms of comacomal, adjectiveWord Origin for comaC17: from Latin: hair of the head, from Greek komē Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for comacoma [ (koh-muh) ] An abnormal state of deep unconsciousness. A coma may occur as the result of trauma to the head, disease (such as meningitis, stroke, or diabetes mellitus), or poisoning. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Medical definitions for comacoma [ kō′mə ] n.A state of profound unconsciousness in which an individual is incapable of sensing or responding to external stimuli. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for coma (1 of 2)coma1 [ kō′mə ] Plural comasA state of deep unconsciousness, usually resulting from brain trauma or metabolic disease, in which an individual is incapable of sensing or responding to external stimuli. Scientific definitions for coma (2 of 2)coma2 [ kō′mə ] Plural comae (kō′mē)Astronomy The brightly shining cloud of gas that encircles the nucleus and makes up the major portion of the head of a comet near the Sun. As a comet moves along its orbit away from the Sun, the gas and dust of the coma dissipate, leaving only the nucleus. A coma can have a diameter of up to 100,000 km (62,000 mi.). See more at comet. Physics A diffuse, comet-shaped image of a point source of light or radiation caused by aberration in a lens or mirror. The image appears progressively elongated with distance from the center of the field of view. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
随便看 |
英语词典包含192737条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。